The only real updates that are listed include a frame rate increase from 5.5 fps to 6 fps, weather sealing like the D800, a quiet continuous shooting frame mode, and enhanced white balance performance.

So, why would Nikon update the D600 less than a year after its release? Well, if I had to guess I would say that Nikon wanted to fix some of the issues they had with the D600 like dust and oil. However, when questioned, Nikon would neither confirm nor deny that statement. They did offer one piece of advice. If a customer is having issues with dust/oil on the D600 they should send it in to Nikon to get serviced.

The Nikon D610 will be available in late October in these configurations: